package test2;

import org.junit.Test;

/*
获取一个字符串在另一个字符串中出现的次数。比如：获取“ ab”在 “abkkcadkabkebfkabkskab” 中出现的次数
 */
public class StringDemo2 {
    public int getCount(String mainStr,String subStr){
        int mainLength=mainStr.length();
        int subLength=subStr.length();
        int count=0;
        int index=0;
        if(mainLength>=subLength){
//            方式一:
//            while ((index=mainStr.indexOf(subStr))!=-1){
//                count++;
//                mainStr=mainStr.substring(index+subStr.length());
//            }
//            方式二:对方式一的改进:
            while((index=mainStr.indexOf(subStr,index))!=-1){
                count++;
                index+=subLength;
            }
            return count;
        }else{
            return 0;
        }
    }
    @Test
    public void test1(){
        String mainStr="abkkcadkabkebfkabkskab";
        String subStr="ab";
        int count=getCount(mainStr,subStr);
        System.out.println(count);
    }
}
